Facebook didn’t invent likes. 
Discussion
It appears I was misinformed 😅
Do you know who invented it ? I’m curious
I’m not sure. It might depend on what counts as a like. Slashdot had upvoting before Facebook existed. The Wikipedia article for “Like button” lists two pre-Facebook implementations, and mentions one was based on Digg’s digg button.
I saw that Wikipedia bit about the Digg button. Makes sense that the like button (or under another name) existed pre-facebook. There were already discussion forums before that time